1.

A convex lens of focal length f produces a real image m times the size of an object, then the distance of the object from the lens is

Answer»

(m + 1)f
(m - 1)f
`((m+1)/m)f`
`((m-1)/m)f`

SOLUTION :We have,
MAGNIFICATION = `f/(f+u)=-m`(given)
or f = -MF - MU
or mu = -(m + 1)f
`thereforeu=-((m+1))/mf`
So, DISTANCE of the object from the lens is `((m+1)/m)f`.


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